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Income Taxes (Details 4) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Deferred tax assets: |  |
Inventory valuation | $ 6,386,000 | $ 5,468,000
Domestic net operating loss carry forwards | 1,144,000 | 1,082,000
Tax credit carry forwards | 4,145,000 | 3,015,000
Foreign net operating loss carry forwards |  | 89,000
Warranty and installation accruals | 2,174,000 | 3,044,000
Equity compensation | 9,114,000 | 5,821,000
Other accruals | 3,270,000 | 2,373,000
Other | 760,000 | 1,636,000
Total deferred tax assets | 26,993,000 | 22,528,000
Valuation allowance | (4,708,000) | (1,765,000)
Net deferred tax assets | 22,285,000 | 20,763,000
Deferred tax liabilities: |  |
Purchased intangible assets | 9,973,000 | 9,818,000
Undistributed earnings | 1,095,000 | 974,000
Depreciation | 7,014,000 | 4,115,000
Total deferred tax liabilities | 18,082,000 | 14,907,000
Net deferred taxes | 4,203,000 | 5,856,000
Undistributed earnings of foreign subsidiaries | 96,400,000 |
Increase in valuation allowance | $ 2,900,000 |

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